Pulp-digester



Patented Oct. 1, 1889.

PULP DIGESTBR.

C. G. SPRINGER.

.w am A A A.,

(No Model.)

UNITED STATES .PATEN PKULP-DIGESTER.

SPECIFICATION forming' part of Letters Patent No. 411,838, dated October 1, 1889.

Application filed January 7, 1888.

Serial No. 295,6ii0i (No model.)

To all whom it may concern:

Be it known that I, CHARLES C. SPRINGER,v

of Boston, county of Suifolk, State of Massachusetts, have invented an Improvement in` Pulp-Digesters, of which the` following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to boilers or digesters employed in the manufacture of pulp from wood and other fiber, and is an improvement upon boilers of that class in which the acid-resisting lining is composed, essentially, of porcelain or lother acid-resisting tile.

My invention has for its object to provide an eicient, simple, and cheap lining; and it consists, essentially, in the combination,with the boiler-shell, of an acid-resisting lining therefor consisting of blocks or tiles, and a backing or covering for each tile composed of lead or acidresisting metal, having side fiaps, the flaps of the coverings of adjacent tiles beingsealed together to effect a liquidtight joint and maintain the lining of tiles intact, substantially as will .be described.

Figure l is a top or plan view of a boiler or digester partially broken out provided with an acidresisting lining embodying my invention, Fig. 2 a vertical section of a sufficient portion of a boiler to enable my invention to be understood, and Fig. 3, a detail in perspective, to be'referred to.

The boiler-shell A, which may be made of steel or iron or other usual metal, is rst preferably covered and protected on its inneru side with a layer a of sheet-lead or other acid' resisting metal orcomposition of metals. The shell A is further protected from the injurious action of the bisulphite orgother chemical solution usually employed by an 4'acid-resisting lining consisting, essentially,

are folded or turned up against the sides of the tile. Between the backing or covering b vand the layer a. is preferably interposed a layer `c of asbestus or other yielding and preferably acid-resistin g material, forming a cushion for the tile.

In practice each block or tile will be covered with its backing b before it is placed in the boiler, and the .side flaps may be turned up and united ,byburningg as by a blow-pipe, so that when the tile is placed Within the boiler the ends of the said flaps will project beyond the face of the tile, as shown at c', `Figa 1. The projecting ends of the side flaps 'willthen be turned, tamped, or hammered down into the space between adjacent tiles to completely fill the space .and effect a liquid-tight joint or seal, and, if desired,the said llead iaps may be burned with a blow-pipe or iin any other usual manner, the camping or :sealing of the lead flaps, together with thev ing made of phosphor-bronze` or other usuall acid-resisting material.

`I claiml. In a boiler or digester for the manufacturing of pulp, the combination, with the boiler-shell, of an acid-resisting liningl therefor consisting of blocks or tiles,l and a backing or covering for each tile composed of lead or acid-resisting metal having side fiaps, the aps ofthe coverings of adjacent tiles. being sealed together to eifect a liquid-tight joint and maintain the lining of tiles intact Within the boiler, substantially as described.

2. In a boiler or digester for the manufac turing of pulp, the combination,with the boiler-shell, and a layer of sheet-lead next to the boiler-shell, Iof an acid-resisting lining TOO therefor consisting of blocks or ti1esand a backing or covering for each tile composed of lead or acid-resisting metal having side flaps, the flaps of the coverings of adjacent tiles being sealed ttgether to eiect aliquidtight joint and maintain the lining of tiles intact Within the boiler, substantially as described. l l

In a, boiler or digester for the manufacturing of pulp, thecombination, with the boiler-shell and a layer of sheet-lead next to the boiler-shell, of an acid-resisting `lining consisting of blocks or tiles, and a backing or covering for each tile composedof sheet-lead having side flaps; and a cushion of asbestus or yielding acid-resisting material interposedv r between the backings or coverings and'thelayer of lead, the flaps of the coverings of the adjacent tiles being sealed together t-o eiect a liquid-tight joint and maintain the lining of tiles intact'within the boiler,subsltantially CHARLES CSPRINGER.

- Witnesses:

J As. Hr CHURCHILL, t FREDERICK, L. EMERY. 

